You must get rid of the ghosts and stop the sunset using your gun. Capture one ghost and connect it with other ghost of the same type and get rid of them. Clear the area from their presence and gain points for it.
You are a real detective, but you do not investigate common things like other detectives do. You keep the peace of these lands, protecting humans from the evil deeds of ghosts. They gather up to darken the sky and turn day into night, however, you can stop this madness. Use your gun to connect ghosts and blow them before they complete their evil plan!